Hi Jonathan and guys,
I wrote a post a few days ago asking for help. I realized I didn´t explain myself with my comments because I posted a screenshot with wrong data, and when I realized about it, I mentioned that I was using now the right data. I never mentioned that anyways it was still not working.
The news is that somehow (don´t really know why), the app started working after a couple day´s struggling, and IT WAS GREAT!!!
The bad news is that after a couple of weeks, it quit working without any reasonable cause. Now I have a bunch of Tuya devices on it´s way, and this better work! 
BTW, when it worked, it was with the TUYA SMART app, and NOT the Smart Life app.
I´ve been playing and struggling with this for two weeks without any success, erasing, reconfiguring, resetting, etc., with no luck.
I just realized there are some differences between a screenshot I made when it worked, and now that it doesn´t. FYI, I´m in Mexico (Code 52).
I´ll post both screenshots and will appreciate any help to make this app work again for me.
Screenshot when the app worked (Please notice the MQTTINFO line on the State Variable section, under endPoint)
Screenshot when the app doesn´t work where there is no MQTTINFO line
Any help will be much appreciated, besides Santa will be generous to you guys!